Can someone please explain in simple language and in step by step terms how to tackle a problem like this?

A block of stone has a mass of 478 kg and a volume of 0.16 m^3. Calculate its density. Give your answer to the nearest whole number and with appropriate SI units.

I have to answer a question that is very similar to this. (Only the numbers have been changed). But I haven't got a clue where to start.

At a guess my instinct is to find a way to convert these numbers into the same or similar units?

I have of course used different numbers here and I am not trying to cheat or anything (it's just a practice question anyway), as I really would like to understand how to do this. But my maths isn't strong (I'm an adult learner BTW), so I would appreciate as simple and clear a breakdown of this problem as possible.

With thanks!